Question Detail

MIC 121 Protozoa Objective Question
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Question

How do freshwater protozoa primarily regulate their water and salt balance (osmoregulation)?
Options
A Through specialized digestive enzymes in food vacuoles.
B By absorbing water through the pellicle.
C Through the continuous expulsion of excess water by specialized contractile vacuoles.
Correct Answer
D By forming a resistant cyst to prevent water intake.
Correct Answer

Option C is the correct answer.

Detailed Explanation

The text explains, 'Excretion of nitrogenous waste (mainly ammonia) and osmoregulation (regulation of water and salt balance) occur through diffusion across the cell membrane and, in freshwater forms, through specialised contractile vacuoles.' It further details that the contractile vacuole collects and expels excess water.

Hint

Consider the organelle unique to freshwater protozoa for maintaining internal water balance.

Question Info

Course: MIC 121
Topic: Protozoa
Type: Objective
Difficulty: Not specified
Question 885 of 984
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